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R in (-oo:+oo)
(-3/4)*R = -1 // + 1
(-3/4)*R+1 = 0
1-3/4*R = 0 // - 1
-3/4*R = -1 // : -3/4
R = -1/(-3/4)
R = 4/3
R = 4/3
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